Based on analysis of the online balancing principle of electromagnetic damping, a damping rotor test - rig was established to investigate the active balancing function of electromagnetic damping.

在分析电磁阻尼器的在线平衡原理基础上，建立了一套电磁阻尼器转子系统实验台。

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With improved transportation, the need for company towns largely disappeared, though communities built for oil rig workers are still active today.

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Even in natural resources, where it has been most active in dealmaking, it is not close to controlling enough supply to rig the market for most commodities.

ECONOMIST: And the world should stay open for business